Improvement in smoke and gas consuming furnaces



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KINGSBURY M. JARVIS, OF MALDEN, ASSIGNOR TO HIMSELF AND ALBERT` F. UPTON, OF NEWTONVILLE, MASSACHUSETTS.

IMPROVEMENT IN SMOKE AND GAS CONSUMING FURNACES.

Specification forming part` of Letters Patent No. 222,631, dated December 16, 1879; application led october 4, i879.

To all whom it may concern: y Be it known that I, KINGSBURY M. Jnnvrs, of Malden, county of Middlesex, State of Massachusetts, have invented an Improvement in Smoke and Gas Consuming Furnaces, of which the following description, in connection with the accompanying drawings, is a specification. My invention relates to furnaces for steam. boilers and other similar purposes, and is intended as an improvement on the furnace invented by me for which Letters Patent Nos. 176,639, April 25, 1876, 186,734, January 30, 1877, and 189,862,April 24, 1877, were granted, to which reference may be had. In those patents air-passages in the side walls of the furnace were described, which I denominatewthe front ducts,7 in which the air circulates, and from which it discharges horizontally into the re or combustion chambernear the bridge- Wall. lOther air-passages, which I now denominate the rear ducts,7 discharge heated air into a chamber behind the bridge-wall,

whence it passes through a perforated plate vertically into the combustion-chamber.

My present invention consists in a novel construction of the chamber behind and in the bridge-wall, such construct-ion permitting the heated air t0 deliver more uniformly into the combustion-chamber.

Figure 1 is a front view of a furnace provided With my improvements; Fig. 2, a rear view thereof, one half the rear wall being shown in section; Figs. 3 and 4, cross-sections in the chamber behind the bridge-wall, on lines a; :c and y y, Fig. 6, respectively; Fig. 5, a sectional view of the side Wall 5 Fig. 6, a longitudinal section of the furnace, on line x x', Fig. 4, and Fig. 7, a sectional plan view on line y" y', Fig. 6.

The boiler a, firechaniber, grate b, ash-pit, and combustionchamber are all as described in aforesaid patents.

The front and rear ducts are shown as both beginning at the front of the furnace at 1 and 2. Y

The rear duct is shown as starting at 1 and passing v,along the side of the combustionchamber, as shown at 3, and by passage 4 to the open space 5 in the rear wall of the furnace, whence it returns to the side wall and winds back and forth therein, as shown at 6 7 8 9, and, finally, enters through passage 10 into the portion c of the chamber behind the bridge-wall.

rlhe portion o of the chamber passesacross through the bridge-Wall, and is connected with the main portion al ot the chamber by a series of vertical slots, c, in the partition f, separating the portions c d of the chamber. v

The heated air from the rear ducts, having been received in the portion d of the chamber, passesup through the perforated plate g, where it mixes with the gases set free from the fuel iu the fire-chamber, ambcauses complete combustion thereof, as described in my previous patents.

The front ducts, receiving air at 2 atthe front of the furnace, pass, as shown at 12 13 14 15 16, back and forth inthe side Wall at the side of the fire-chamber, and, finally, deliver the air, heated in its passage, through the perforated plates t' into the furnace near, but above, the bridge-wall.

It will be observed that the ducts increase i in sectional area from the point at which the air is received to that where it is delivered, to allow the air to expand freely as it becomes heated in its progress through said ducts.

` It will also be seen that nearly the whole heating portion of the furnace-walls is traversed by the air to be heated.

The perforations in the plates g t', which are preferably made ot' nre-brick material, are made tapering, as clearly shown in the' sectional views. In the plates g the perforations are larger at the under side of the plate, and consequently any ashes or other matter which may have passed through the upper orifice of the perforation immediately drops down into the chamber d without clogging the perforations.

Doors m a are provided in the side walls for cleaning out the chamber d and the top of plate g. y

The perforations in the plate t are largest at the inside of the furnace, and, besides being kept clear by the draft of air through them, also permit the expansion of said jets of air during their passage through the plates. The direction of the air-currents is everywhere clearly indicated by arrows.

.I claim- In a smoke and gas consuming furnace, a chamber, c d, in and behind the bridge-wall, divided by apartition provided with openings to connect the two portions of the chamber, combined with the bridge-Wall, and the heatedair ducts, arranged, as described, to Wind back and forth continuously in the Walls ofthe furnace to convey air, heated in its passage, to the eh amber, and the perforated deliveryplate, all substantially as described.

In testimony whereof Ihave signed mynamc to this speeiieation in the presence of two, subscribing Witnesses.

KINGSBURY M. JARVIS.

Witnesses:

ALBERT F. UPToN, JosEPH A. GRANT. 

